Perhaps you should try some spelling variations:
sach tham » sach nha
pham chuc » pham duc, pham huu, kham chua
van hanh » van thanh, ban hanh, van anh
so sach » so sanh, bo sach, co sach
nang xa » nang x, nang ma, mang xa
lai cua » dai cua, hai cua, lai chau
lang xa » lang ha, dang xay, lang van
va danh » va dinh, va dan, va hanh
v pham » vi pham, d pham
hieu v » hieu va, hieu ve, hieu 2
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: so sach tham ((nang xa) OR (lang xa)) hoi. hieu v pham chuc ((van hanh) or (va danh)) lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach tham ((nang xa) OR (lang xa)) hoi. hieu v pham chuc ((van hanh) OR (va danh)) lai cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach tham ((nang xa) OR (lang xa)) hoi. hieu v pham chuc ((van hanh) or (va danh)) lai cua te".
• Adding a wildcard symbol may retrieve word variants: so sach tham ((nang xa) OR (lang xa)) hoi. hieu v pham chuc ((van hanh) or (va danh)) lai cua te*.